A method for producing an alloy self-brazing strip. In an aspect, a process is used to generate a multi-layer alloy strip made up of at least one base layer of with a least another layer of material, that when both the material and base layer are brazed, form an alloy. In an aspect, the other layer of material can include a metal. The base layer can include titanium or a titanium alloy.
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7. A method for creating a self-brazing alloy product, comprising:
forming a base layer from titanium;
forming at least one other layer from copper and/or nickel; and
bonding the base layer to the at least one other layer, wherein some of the titanium of the base layer of material is extracted and interacts with the at least one other layer of material to form an in-situ synthesized brazed titanium alloy upon brazing wherein the brazing is applied between 1785 Fahrenheit and 1922 Fahrenheit.
1. A method for creating a self-brazing alloy product, comprising:
forming a base layer of first material of titanium or titanium alloy;
forming at least one other layer of second material comprising copper or nickel; and
bonding the base layer of the first material to the at least one other layer of the second material, wherein, upon brazing, some of the titanium of the base layer is drawn into the at least one other layer to form an in-situ synthesized brazed product wherein the brazing is applied between 1785 Fahrenheit and 1922 Fahrenheit.
14. A method for creating a self-brazing product comprising the steps of:
a. providing a material comprising titanium or titanium alloy to form a base layer;
b. cladding the base layer to another layer comprising copper and/or nickel;
c. cutting the cladded material into self-brazing parts of a desired shape; and
d. brazing the self-brazing parts together, wherein the brazing forms a brazing alloy from the base layer without the need for brazing foils, fluxes or powdered products in a jointing phase wherein the brazing is applied between 1785 Fahrenheit and 1922 Fahrenheit.
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The present application claims priority from Provisional Patent Application No. 62/152,636, filed on Apr. 24, 2015, the disclosure of which is relied upon and incorporated herein by reference.
The present invention generally relates to processes of forming self-brazing materials. Specifically, the present invention relates to self-brazing materials where different metals, such as titanium, are used as a base material in the constituent composition (e.g. Ti-Based material).
Generally, brazing (including titanium brazing) involves expensive braze components where the cost is driven by the type of metal used, part complexity and end use requirements.
Traditionally titanium has been brazed either with clad TiCuNi foils or TiCuNi in the powder form. Both processes involve stacking layers of titanium (base metal) with intermittent braze foil/powder and brazing in a highly controlled atmosphere. Such processes have a complicated assembly operation, long assembly time and high yield losses combined with use of expensive vacuum furnaces. The additional actions required in individual stacking the base material and filler metal renders the overall brazing process difficult to automate. Further, individually stacking the base material and filler metal is significantly time consuming and often results in a poor intimate contact between the base metal and the filler material, producing poor braze quality and failed parts. Poor contact between a braze filler and base material can also cause oxidation of surface material which degrades the overall braze quality. Such issues often cause a significant loss in the overall yield of the brazed material. Therefore, there is a need to address the described challenges.
The present invention is directed at a method for producing a titanium alloy self-brazing strip or other applications that contain filler metal-base metal combinations which allow extracting desired braze constituent elements from the base metal to perform an in-situ braze alloy during brazing. In an aspect, other braze filler metal combinations can be used.
These and other aspects of the invention can be realized from reading and understanding of the detailed description and drawings.
The new process for creating a self-brazing product is described herein. More specifically, a self-brazing alloy strip is created from the process. In effect, a base is joined with another or multiple layer(s) of different materials that can be later brazed, as shown in
In an aspect, the multi-layer product comprises at least one metal base layer that is joined with at least another layer of metal. In an exemplary aspect, the multi-layer product comprises at least one base layer of titanium (Ti) or titanium alloy that is joined with at least another layer of metal that, when both layers (i.e., the base and other layer) are brazed, form a titanium alloy. In reference to the Ti base layer product, each strip/foil of the self-brazing product comprises discrete layers. In an exemplary aspect, the other metal can include copper (Cu), nickel (Ni) or Zirconium (Zr). The layers are selected according, but not limited, to: (a) brazing temperature (e.g. Zr can be added as an extra layer as melting point depressant)—for lower preferred brazing temperature; and (b) ease of bonding—just one layer can be used to braze. In an aspect, the multi-layer titanium alloy strip can include at least one base layer of titanium (or titanium alloy) along with multiple layers of other metals. The combination of the base layer of titanium and at least one other layer of metal creates a multi-layer titanium alloy self-brazing strip, as shown in
While the exemplary aspect above focuses on a self-brazing product that has a base material of titanium/titanium alloy to form a titanium alloy when brazed, other base materials, as well as other materials in the other layers, can be used. However, it should be noted that the plurality of layers and base material can include any desired metal or metal alloy sufficient for achieving end product goals. Table 1 details some ideal braze filler metals according to possible base material (e.g. metal) combinations.
TABLE 1
Braze filler metal by base metal combination
Braze Filler Metal
Chemical Composition
Base Material
BAlSi
Silicon (6 to 13%)
Aluminum and aluminum
remainder Aluminum
alloys
BCu
Phosphorus, Silver and
Copper and copper alloys
remainder Copper
BTi
See above
Titanium Base alloys
The additional layers are bonded to the base layer through various means, as discussed below. In an aspect, the other materials can be found on either one side (see
In an aspect, when the self-brazing product is configured to produce a titanium alloy, the strip/foil can include, but are not limited to, the following combination of materials in layered order: Cu/Ti/Cu, Ni/Ti/Ni, Ni/Ti/Cu, Cu/Ti/Ni, Cu/Ni/Ti/Ni/Cu, Ni/Cu/Ti/Cu/Ni, Ni/Cu/Ti/Cu/Ni, Cu/Ni/Ti/Cu/Ni, Zr/Cu/Ti/Cu/Zr, Zr/Ni/Ti/Ni/Zr, Zr/Ni/Ti/Cu/Zr, Zr/Cu/Ti/Ni/Zr, Zr/Ni/Ti/Ni/Cu, Zr/Cu/Ti/Cu/Ni, Ni/Cu/Ti/Cu/Zr, and Cu/Ni/Ti/Cu/Zr among other combinations.
The bonding of the material can be done through a clad approach, such as a roll bonding application, as shown in
Kirkendall voids form at temperatures above 1200 F. (650 C.) for the Copper-Nickel binary phase system. As such, the post heat treatment should ideally be set at 1200 F. or lower. In an aspect, although the titanium will not be completely annealed at temperatures of 1200 F. or lower, it should be sufficiently stress relived to enable further forming operations. It should be noted that, during heat treatment (i.e., the treatment of the multi-layer product before brazing), copper and nickel will mix and alter the chemistry of the product during brazing.
Once the multi-layer product is formed (See
After the needed pieces/components/parts have been made from the self-brazing alloy strip, the components can then be placed together in the desired orientation and brazed to join the components together (step 300). When the brazing occurs, a small amount of the base material can be drawn into the other layers of materials, producing an in-situ braze. Such a process of drawing the base material into a braze joint avoids stacking layers of brazing fillers which contains the base material necessary for brazing, thus producing a more intimate contact and better braze quality. For example, when the base includes titanium and the other layers include nickel or copper alloys, a small amount of the titanium from the base can be drawn into and mixed with the copper and nickel layers.
After carefully selecting the composition and brazing temperature, a braze joint can be achieved, drawing a small amount of titanium from the base metal, by mixing the base metal with the filler metals such as Ni and Cu. The result is an in-situ braze product. For example, to produce a brazed 0.050 inch titanium product with a ratio 15 wt % Cu, 15 wt % Ni and 70 wt % Ti (which is a commercially available braze composition) available at the interface, the bonded layers will have thickness measurements of 0.00075 inches Ni and 0.00075 inches Cu on both sides of a 0.057 inch layer of titanium. During the brazing process, 0.007″ inches of titanium will go into the brazing, resulting in a 0.050 inch layer of titanium. The brazing temperature is between 1785 F. (975 C.)-1922 F. (1050 C.). As previously mentioned, the brazing temperature must be carefully controlled because a change in brazing temperature can result in a change in the in-situ braze alloy which can in turn change the amount of titanium extracted from the base metal.
While U.S. Pat. No. 7,527,187 discloses a brazing of a foil to the base material (Ti), the process described above utilizes the base material (e.g., Ti) in the brazing process. In other words, instead of adding a brazing alloy to the base material, the base material is used to form the brazing alloy.
Metals like titanium are reactive and combine with oxygen, carbon, hydrogen and nitrogen readily. As such, it is imperative that highly controlled vacuum furnaces are used to braze exposed titanium products. In an aspect, results from the present invention indicate that the carbon in the graphite elements react with the titanium and form barriers for an ideal braze. Cladding multilayers on both sides of the base titanium avoids exposure to atmosphere which in turn enables the use of furnaces that are less expensive and have less controlled atmospheres.
The products made after the brazing can be used in a variety of operations, including, but not limited to, high volume manufacturing operations, such as the production of heat exchangers, brazed bellows and honeycomb structures. By creating the self-brazing alloy product, there is no need for brazing foils, fluxes and powdered products in the joining phase.
Having thus described exemplary embodiments of a method to produce metallic composite material, it should be noted by those skilled in the art that the within disclosures are exemplary only and that various other alternatives, adaptations, and modifications may be made within the scope of this disclosure. Accordingly, the invention is not limited to the specific embodiments as illustrated herein, but is only limited by the following claims.
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